Introduce STT proof-of-concept

Using OpenAI's whisper neural network, we can do local STT. Translation
quality is good, system resource usage is minimal (1 GB VRAM), latency
is much lower than cloud-based translation.

* Add transcribe.py
  * Creates 3 threads:
    * One saves mic audio to a buffer
    * One passes mic audio to the STT
    * One sends the transcribed text to the board
  * Main thread listens for input. Press enter to start a new message.
* Add osc_ctrl.sendMessageLazy, a simple diff-based message sending utility.
  * A little complexity: it only sends 1 empty cell per call, allowing us to
    quickly say new things without having to wait for the whole buffer to
    clear.

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